The first law of thermodynamics is usually written as Eth=Q+W You need to look a

Question

The first law of thermodynamics is usually written as Eth=Q+W You need to look at the signs carefully; some other disciplines (chemistry, for example) and some other textbooks may use other signs, which implies other definitions of these quantities.

Part A

Which physical law underlies the first law of thermodynamics?

conservation of work

Part B
When the quantity Q is greater than zero, __________ is added to the system.

   work
   heat
   thermal energy

Part C

When the quantity W in the first law is greater than zero, it refers to the __________.

Part D

The quantity Eth in the first law of thermodynamics is the change in the __________ of the system.

conservation of work

Part B
When the quantity Q is greater than zero, __________ is added to the system.

   work
   heat
   thermal energy

Explanation / Answer

Part A) the first law of thermodynamics is about law of conservation of energy

So the answer is

conservation of energy

B) Heat is addedto the system

C) W = P*dV

if W is positive then change in volume dv is also positive

then Work is done on the system

D) Eth is the change in internal energy or change in thermal energy

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